2-Nitrophenyl β-D-galactopyranoside - 1 gram

2-Nitrophenyl β-D-galactopyranoside (ONPG) is a chromogenic substrate widely used for β-galactosidase enzyme assays. Upon enzymatic hydrolysis, ONPG releases o-nitrophenol, producing a yellow color measurable at 420 nm, allowing quantitative analysis of β-galactosidase activity.

This high-purity compound is ideal for molecular biology, microbiology, and biochemistry research, including lac operon studies, enzyme kinetics, and reporter gene assays. Supplied as 1 g solid, it can be easily dissolved in buffer solutions for laboratory experiments.